code: def test_gpu(self):
      self._test(gpu=0)
  
file_path: pfrl/tests/utils_tests/test_batch_states.py
imports: import unittest
  import numpy
  import pytest
  import torch
  import pfrl
label_desc: Use image node_id 3 for calling the TestBatchStates obj's underlying member method code with example usage: obj.test_gpu() without return types